Untangled Pro is awfully challenging. With many tricky levels to clear, this game will drive you crazy. Unlock the levels by solving the mystery puzzle.
If you are looking out for a brainteaser, this one is an easy recommendation

Untangled Pro is a game made to test your logical skills. Give some work to your brain and solve the complex puzzles. This game of strings and nodes will leave you perplexed. Download now and take up the challenge.